Air-brake



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8 Y AIR BRAKE. 180.882,748. Patented May 15,1888.

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.PATENT OFFICE.

ALFRED n. Bonuss, or NonwooD, onto.

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srncrrr,cArrorr forming part pfjn'tersratent No. saaveadateanmay- 15, 1888.1

A I Application liled J nly`1i9, 14387.. Serial No. 244.772. (No model.)

.T0 all whom itvnay concern,.-

Be it known' that I, ALFRED B. BoLUss, a citizen of the'United States, residing at Nor'- Wood, in the countyof Hamilton and State of Ohio, have inventedcertain new and useful Improvements in Air-Brakes; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the salue.

This invention relates to certain improvements in air-brakes for cars; and it has for its objects to provide for applying and releasing the brakes by the variable pressure of air in the pipes which supply the air to the brakecylinder, so as to operate the brakes and thus reduce the liability to accident, as more fully hereinafter explained. w .if

The above-mentioned objects I attain bythe means illustrated in the accompanying drawings, in which- Figure 1 represents a plan View of abottom of a car-truck, showing my improved brake applied thereto; and Fig. A2.represents a top view, enlarged, of the valve for admitting andV .exhausting the air-from the brake-cylinder and the mechanism for operating said valve.V Fig. 3 is a horizontal sectional View taken on the linea x, Fig. 5. Fig 4 represents a side elevation of the brakecylinder, pneumatic valve-chamber, and pipe-connections of lthe brake; and Fig. 5 represents an end view looking at the rear of the brake-cylinder, and

showing the two-way valve, its valve-rod, and operating mechanism.

Referring to the drawings, the letter A indicates the brake-operating cylinder, whichl has arranged within it a series of expanding and contracting pistons, B, arranged to recip-` rocate in said cylinder to operate the brakerod C, which is connected 'with said pistons at one end. The said pistons consist of a series of plungers'arranged to reciprocate in said cylinder and having heads K at each end an- 4nularly grooved in opposite directions.` I-n connection with said annularly-grooved heads and the annularlyfgrooved central section extends a pipe, D, connecting with the air-pressure mechanism on the engine. The respective 5o plungers of the piston are joined by flexible F, by means of whichV thebrake-rods 4are operated, as more'fullyhereinaft'er specified,

The letter G indicates a valve-chambenwhich is bolted to a seat on the brake-cylinder, or otherwise conveniently secured in connection with connectionsE and intermediate ribbed rings,

left between the two, for the purpose'hereinafter described.

' Theletter L indicates a valve-stem, which passes backward through a tubular extension,

M, of the plunger-chamber, and which is sur-A roundedby a spiralspring, N, whichkeeps y the plunger pressed normally toward the head of the cylinder before mentioned. The rear end of said rodconnects with a wristpin,.1?, on the faceof a disk, B, whichis se'c'uredto a shaft, S, oneY end of whichI passes intoa valvechamber, T, and is provided witha'valve, U,

for the purpose hereinafter explained.

Theletter V indicates a pipe leading from i the compressed-air reservoir on the engine, and connecting by means of a'branch-pipe, B',

'with thevalve-chamber T, above mentioned,

and also by means of the pipe D with the annular chamber of the head K of the cylinder B. The plunger-chamber communicates with the supply-pipe V by means'of a branch pipe, A. v

, The Valve-chamber T connects with the pipe leading to the expanding plungers in the brake-chamber before mentioned, and to the openair through a suitable branch pipe, the valve therein being a two-way valve arranged so as to admit the compressed air to the brakecylinder to set the brakes and exhaust the same `to release said brakes, as will more fully here'- inafterappear. After the pressure is removed from the interior of the plungers in cylinder B, the air which was compressed in' this cylin-v der. at one end thereof will react to collapse the diaphragms of the said plungers. l n .i The operation of myinvention will be readily understood in connection with the above description, and is as follows: y

Thepipe V is provided with a valve under IOG control ofthe engineer, so that he can instantaneously change the pressure of air in said pipe. To apply the brake, the said valve is operated to turn the full pressure of air on. This, entering the plunger I-I in its chamber, expands the said plunger, forcing the valverod Lbackward and turning the two-way valve before mentioned into position to admit the air into the brakecylinder, so as to operate the pistons or plunger' therein to set the brakes. To release the brakes, it is only necessary to relieve the pressure in the pipes by means of the eontrollingvalve, when the spiral spring N will throw the valve to its normal position, so as to open the exhaust aud permit the air contined in the brake-cylinder to escape and the pistons therein to fall back.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, 1s

l. In an atmospheric railroad-car brake, the combination, with the cylinder A, provided with hollow expansible plungers and a brakerod, ofthe air-supply pipe D, connected to the head of an end plunger, a tWo-Way oscillating valve at thejunetion of pipes B and D, and a supplemental expansible plunger applied in a cylinder communicating with the main Supplypipe V, and provided with a recoil-spring and l a rod adapted to oscillate said valve, ,all substantially as described.

2. The combination,in an atmospheric brake, of expansible plungers communicating by means of a branch pipe with a main supplypipe, a cut-ofi' valve in said branch pipe, said plungers arranged in a closed cylinder, and a supplemental expansible plunger actuated by the pressure of air and a recoil-spring, and suitably connected to the stem of the said cut off valve, substantially as described.

3. The combination of the closed cylinder, eXpansible plungers therein, a brake-rod, a supply branch pipe, D, the main supply-pipe V, the branches A B', the cut-off valve at the junction of pipes D B, an expansible plunger, and a recoil-spring for oscillating said valve, substantially as described.

In testimony whereofI aiiix my signature in presence of two Witnesses.

ALFRED R. BoLuss.

Witnesses:

EMMA M. GILLETT, JOHN G. KROHR. 

